Check if wireless.radio0 is disabled

[HipsterBrown]

Fixes #972

Smoke test:

The only way I've figured out how to recreate this issue is to manually disable the radio0 wireless interface. I would suggest doing this over USB using dterm or screen because an ssh session will cut off as soon as the radio is disabled, i.e. screen /dev/tty.usb<tab complete from here> and hit the "enter" key twice.

Once rooted into your Tessel, run the following commands:

uci set wireless.radio0.disabled='1'
uci commit wireless

While still rooted, running wifi should give you the error 'radio0' is disabled. To leave the screen session, hit Control+a+\ then type "y".

Now that the wireless radio has been disabled:

1. Check out this branch
2. npm link . (if you haven't linked this locally yet)
3. t2 wifi -n "Your Network Name" -p PasswordIfNeeded123

You should get the following output:

hipsterbrown:t2-cli (handle-wifi-radio) $ t2 wifi -n "My Network Name" -p MyPassword
INFO Looking for your Tessel...
INFO Connected to tessel-router.
INFO Wifi Enabled.
INFO Wifi Connected. SSID: My Network Name, password: MyPassword, security: psk2

Let me know if there are any questions.

[rwaldron]

What happens if there is an error that doesnt include "'radio0' is disabled"? I think this needs to return Promise.resolve()?

(Sorry, I reposted this because I'm not sure if we're officially using Github Review yet)

[HipsterBrown]

I believe, and after experimenting, once the execution of a thenable function finishes, the Promise will continue to the next chained method. Returning in a thenable function will pass that value to the next thenable.

[rwaldron]

Keeping track of promises is not my cup of tea. Thanks for clarifying

[HipsterBrown]

@rwaldron Pushed a test to confirm your comment.